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<!DOCTYPE html>
<title>CSS Anchor Positioning: anchor-scope:all is tree-scoped</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#anchor-scope">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/10525">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#host::part(scope) {
/* This should have no effect, because 'all' is tree-scoped,
and specified in a different tree-scope than the anchor names
in the shadow. */
anchor-scope: all;
}
</style>
<div id=host>
<template shadowrootmode=open>
<style>
.anchored {
background: coral;
position: absolute;
top: anchor(bottom, 1px);
position-anchor: --a;
width: 5px;
height: 5px;
}
.anchor {
background: skyblue;
height: 10px;
anchor-name: --a;
}
.cb {
position: relative;
width: 200px;
height: 200px;
border: 1px solid black;
}
.scope {
anchor-scope: --a;
}
</style>
<div class=cb>
<div class=anchor></div>
<div part=scope>
<div class=anchored></div>
</div>
</div>
</template>
</div>
<script>
test((t) => {
let e = host.shadowRoot.querySelector('.anchored');
assert_equals(getComputedStyle(e).top, '10px');
}, 'anchor-scope:all is tree-scoped');
</script>
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